Switch upgrade jobs to be non-voting

At the moment, the jobs are all failing because of a change that
was done in openstack-ansible-plugins to support Ansible 2.5.

The plan is to use the integrated repo to do all of the CI including
upgrading evenutally so we will be disabling this job for now until
we can hit that point (this cycle, hopefully).

Change-Id: If0bf32b10237679248e6b90f9240a3e3ae3967ad

zuul.d/jobs.yaml

@@ -100,6 +100,11 @@
 - job:
     name: openstack-ansible-upgrade
     parent: openstack-ansible-functional
+    # TODO(mnaser): We need to switch to using the integrated repo for the
+    #               upgrade tests down the line because the current role upgrade
+    #               jobs don't properly do upgrades and use roles from master
+    #               with roles from older stable branches.
+    voting: false
     description: |
       Run upgrade tests for an OpenStack-Ansible project.
       Uses tox with the ``upgrade`` environment.
@@ -171,6 +176,11 @@
     parent: openstack-ansible-functional
     nodeset: centos-7
 
+- job:
+    name: openstack-ansible-upgrade-centos-7
+    parent: openstack-ansible-upgrade
+    nodeset: centos-7
+
 - job:
     name: openstack-ansible-functional-distro_install-centos-7
     parent: openstack-ansible-functional